Commit aa431613 authored by Manuel Pégourié-Gonnard's avatar Manuel Pégourié-Gonnard
Browse files

Add ecdsa example program

parent 8eebd012
......@@ -84,7 +84,8 @@ int ecdsa_verify( const ecp_group *grp,
const ecp_point *Q, const mpi *r, const mpi *s);
/**
* \brief Compute ECDSA signature and write it to buffer
* \brief Compute ECDSA signature and write it to buffer,
* serialized as defined in RFC 4492 page 20.
*
* \param ctx ECDSA context
* \param hash Message hash
......
......@@ -9,6 +9,7 @@ hash/sha2sum
pkey/dh_client
pkey/dh_genprime
pkey/dh_server
pkey/ecdsa
pkey/key_app
pkey/key_app_writer
pkey/mpi_demo
......
......@@ -91,6 +91,10 @@ pkey/dh_server: pkey/dh_server.c ../library/libpolarssl.a
echo " CC pkey/dh_server.c"
$(CC) $(CFLAGS) $(OFLAGS) pkey/dh_server.c $(LDFLAGS) -o $@
pkey/ecdsa: pkey/ecdsa.c ../library/libpolarssl.a
echo " CC pkey/ecdsa.c"
$(CC) $(CFLAGS) $(OFLAGS) pkey/ecdsa.c $(LDFLAGS) -o $@
pkey/key_app: pkey/key_app.c ../library/libpolarssl.a
echo " CC pkey/key_app.c"
$(CC) $(CFLAGS) $(OFLAGS) pkey/key_app.c $(LDFLAGS) -o $@
......
......@@ -7,6 +7,9 @@ target_link_libraries(dh_genprime polarssl)
add_executable(dh_server dh_server.c)
target_link_libraries(dh_server polarssl)
add_executable(ecdsa ecdsa.c)
target_link_libraries(ecdsa polarssl)
add_executable(key_app key_app.c)
target_link_libraries(key_app polarssl)
......
/*
* Example ECDSA program
*
* Copyright (C) 2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "polarssl/config.h"
#include "polarssl/entropy.h"
#include "polarssl/ctr_drbg.h"
#include "polarssl/ecdsa.h"
#include <string.h>
#include <stdio.h>
/*
* Uncomment to force use of a specific curve
#define ECPARAMS POLARSSL_ECP_DP_SECP256R1
*/
#if !defined(ECPARAMS)
#if defined(POLARSSL_ECP_DP_SECP192R1_ENABLED)
#define ECPARAMS POLARSSL_ECP_DP_SECP192R1
#elif defined(POLARSSL_ECP_DP_SECP224R1_ENABLED)
#define ECPARAMS POLARSSL_ECP_DP_SECP224R1
#elif defined(POLARSSL_ECP_DP_SECP256R1_ENABLED)
#define ECPARAMS POLARSSL_ECP_DP_SECP256R1
#elif defined(POLARSSL_ECP_DP_SECP384R1_ENABLED)
#define ECPARAMS POLARSSL_ECP_DP_SECP384R1
#elif defined(POLARSSL_ECP_DP_SECP521R1_ENABLED)
#define ECPARAMS POLARSSL_ECP_DP_SECP521R1
#endif
#endif /* !defined(ECPARAMS) */
#if !defined(POLARSSL_BIGNUM_C) || !defined(POLARSSL_ECDSA_C) || \
!defined(POLARSSL_ENTROPY_C) || !defined(POLARSSL_CTR_DRBG_C) || \
!defined(ECPARAMS)
int main( int argc, char *argv[] )
{
((void) argc);
((void) argv);
printf("POLARSSL_BIGNUM_C and/or POLARSSL_ECDSA_C and/or "
"POLARSSL_ENTROPY_C and/or POLARSSL_CTR_DRBG_C not defined,"
"and/or not EC domain parameter available\n" );
return( 0 );
}
#else
int main( int argc, char *argv[] )
{
int ret;
ecdsa_context ctx_sign, ctx_verify;
entropy_context entropy;
ctr_drbg_context ctr_drbg;
unsigned char hash[] = "This should be the hash of a message.";
unsigned char sig[512];
size_t sig_len;
const char *pers = "ecdsa";
((void) argv);
ecdsa_init( &ctx_sign );
ecdsa_init( &ctx_verify );
memset(sig, 0, sizeof( sig ) );
ret = 1;
if( argc != 1 )
{
printf( "usage: ecdsa\n" );
#if defined(_WIN32)
printf( "\n" );
#endif
goto exit;
}
/*
* Generate a key pair for signing
*/
printf( "\n . Seeding the random number generator..." );
fflush( stdout );
entropy_init( &entropy );
if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
printf( " failed\n ! ctr_drbg_init returned %d\n", ret );
goto exit;
}
printf( " ok\n . Generating key pair..." );
fflush( stdout );
if( ( ret = ecdsa_genkey( &ctx_sign, ECPARAMS,
ctr_drbg_random, &ctr_drbg ) ) != 0 )
{
printf( " failed\n ! ecdsa_genkey returned %d\n", ret );
goto exit;
}
printf( " ok (key size: %d bits)\n", (int) ctx_sign.grp.pbits );
/*
* Sign some message hash
*/
printf( " . Signing message..." );
fflush( stdout );
if( ( ret = ecdsa_write_signature( &ctx_sign,
hash, sizeof( hash ),
sig, &sig_len,
ctr_drbg_random, &ctr_drbg ) ) != 0 )
{
printf( " failed\n ! ecdsa_genkey returned %d\n", ret );
goto exit;
}
printf( " ok\n" );
/*
* Signature is serialized as defined by RFC 4492 p. 20,
* but one can also access 'r' and 's' directly from the context
*/
#ifdef POLARSSL_FS_IO
mpi_write_file( " r = ", &ctx_sign.r, 16, NULL );
mpi_write_file( " s = ", &ctx_sign.s, 16, NULL );
#endif
/*
* Transfer public information to verifying context
*/
printf( " . Preparing verification context..." );
fflush( stdout );
if( ( ret = ecp_use_known_dp( &ctx_verify.grp, ctx_sign.grp.id ) ) != 0 )
{
printf( " failed\n ! ecp_use_known_dp returned %d\n", ret );
goto exit;
}
if( ( ret = ecp_copy( &ctx_verify.Q, &ctx_sign.Q ) ) != 0 )
{
printf( " failed\n ! ecp_copy returned %d\n", ret );
goto exit;
}
ret = 0;
/*
* Verify signature
*/
printf( " ok\n . Verifying signature..." );
fflush( stdout );
if( ( ret = ecdsa_read_signature( &ctx_verify,
hash, sizeof( hash ),
sig, sig_len ) ) != 0 )
{
printf( " failed\n ! ecdsa_read_signature returned %d\n", ret );
goto exit;
}
printf( " ok\n" );
exit:
#if defined(_WIN32)
printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}
#endif /* POLARSSL_BIGNUM_C && POLARSSL_ECDSA_C &&
POLARSSL_ENTROPY_C && POLARSSL_CTR_DRBG_C &&
ECPARAMS */
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